[poky] --with-gxx-include-dir and sysroot

[Tian, Kevin]

>From: Lu, Lianhao
>Sent: Thursday, December 30, 2010 5:43 PM
>>>>
>>>> I really don't think its this simple.
>>>>
>>>> Looking at the gcc code, I propose we patch cppdefault.c so instead
>>>> of
>>>>
>>>> GPLUSPLUS_INCLUDE_DIR "G++", 1, 1, 0, 0
>>>>
>>>> is says
>>>>
>>>> GPLUSPLUS_INCLUDE_DIR "G++", 1, 1, 1, 0
>>>>
>>>> and then we only ever specify:
>>>>
>>>> --with-gxx-include-dir=${includedir}/c++/ to build the compiler.
>>>>
>>>> Since we set always set --sysroot for the compiler correctly, this
>>>> should then fix all the problems in a clean and simple way.
>>>>
>>>> Why? Changing the 0 -> 1 above will cause c++ to add the sysroot to
>>>> GPLUSPLUS_INCLUDE_DIR and in turn this means it should start to
>>>> behave sanely.
>>>>
>>>> I don't like patching gcc like this but in this case I believe the
>>>> standard settings are just plain wrong and with that simple change,
>>>> things will just work as they should...
>>>>
>>>> Of course I've not tested this so I'd appreciate feedback but I
>>>> think it will solve the problem in the simplest way :)
>>>>
>>>
>>> That's a good and simple idea! I'll try it, but the test may take
>>> time... :-)
>>>
>>
>> I've at least verified this change working in one of my sstate build,
>> where c++ include dir could be searched successfully relative to sysroot.
>>
>> Lianhao is helping me test SDK multiple sysroot scenario, and I'm
>> testing more archs to ensure it not breaking normal build.
>
>The simple helloworld CPP can be built successfully by Kevin's new cross-candian-gcc now.
>But another complex CPP project Sudoku still have the building problems, complaining about
>not finding c++ header "#include <algorithm>". The strace output shows that the failure
>is caused by not finding the algorithm.gch on the target.
>
>> http://git.pokylinux.org/cgit/cgit.cgi/poky-contrib/log/?h=tk/cplusplu s
>>
>

where is that algorithm.gch supposed to stay? I searched my standard c++ include
dir (usr/include/c++) with below finding:

usr/include/c++/ext/algorithm
usr/include/c++/algorithm

is above "algorithm" the one you mentioned as "algorithm.gch"?

Thanks
Kevin